参数资料
| 型号： | SC4524CSETRT |
| 厂商： | Semtech |
| 文件页数： | 11/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 2A 8SOIC |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1 V ~ 26.88 V |
| 输入电压： | 3 V ~ 28 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 300kHz ~ 1.3MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm Width）裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-SOIC-EP |
| 其它名称： | SC4524CSEDKR |
SC4524C
Applications Information (Cont.)
To allow for transient headroom, the minimum operating
switch on time should be at least 20% to 30% higher than
the worst-case minimum on time.
200
An inductor ripple current between 20% to 50% of the
maximum load current gives a good compromise among
efficiency, cost and size. Re-arranging the previous
equation and assuming 35% inductor ripple current, the
inductor is given by
180
V O = 1 .5V , I O = 1A , 1 M H z
L 1 =
( V O + V D ) x ( 1 ? D )
35 % x I O x F SW
160
If the input voltage varies over a wide range, then choose
140
120
L based on the nominal input voltage. Always verify
converter operation at the input voltage extremes.
The peak current limit of SC4524C power transistor is at
least 2.6A. The maximum deliverable load current for the
100
-50
-25
0
25
50
75
100 125
SC4524C is 2.6A minus one half of the inductor ripple
current.
Temperature ( O C)
Figure 4 — Variation of Minimum On Time
with Ambient Temperature
Input Decoupling Capacitor
The input capacitor should be chosen to handle the RMS
ripple current of a buck converter. This value is given by
Minimum Off Time Limitation
I RMS _ CIN = I O x
D x ( 1 ? D )
The PWM latch in Figure 2 is reset every cycle by the
clock. The clock also turns off the power transistor to
refresh the bootstrap capacitor. This minimum off time
limits the attainable duty cycle of the regulator at a given
switching frequency. The measured minimum off time is
The input capacitance must also be high enough to keep
input ripple voltage within specification. This is important
in reducing the conductive EMI from the regulator. The
input capacitance can be estimated from
00ns typically. If the required duty cycle is higher than
the attainable maximum, then the output voltage will not
be able to reach its set value in continuous-conduction
mode.
C IN >
I O
4 x D V IN x F SW
Inductor Selection
The inductor ripple current for a non-synchronous step-
down converter in continuous-conduction mode is
where D V IN is the allowable input ripple voltage.
Multi-layer ceramic capacitors, which have very low ESR
(a few m W ) and can easily handle high RMS ripple current,
D I L =
( V O + V D ) x ( 1 ? D )
F SW x L 1
are the ideal choice for input filtering. A single 4.7μF
X5R ceramic capacitor is adequate for 500kHz or higher
switching frequency applications, and 0μF is adequate
for 200kHz to 500kHz switching frequency. For high
where F SW is the switching frequency and L is the
inductance.
voltage applications, a small ceramic ( μF or 2.2μF) can be
placed in parallel with a low ESR electrolytic capacitor to
satisfy both the ESR and bulk capacitance requirements.
相关PDF资料 |
PDF描述 |
|---|---|
| SC4524DSETRT | IC REG BUCK ADJ 2A 8SOIC |
| SC4524SETRT | IC REG BUCK 2A 8SOIC |
| SC4525ASETRT | IC REG BUCK 3A 8SOIC |
| SC4525CSETRT | IC REG BUCK ADJ 3A 8SOIC |
| SC4525DSETRT | IC REG BUCK ADJ 3A 8SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SC4524CSETRT-CUT TAPE | 制造商:SEMTECH 功能描述:SC4524 Series 28 V 2 A 2 MHz Step-Down Switching Regulator - SOIC-8 |
| SC4524D | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:18V 2A Step-Down Switching Regulator 2A Output Current |
| SC4524DSETRT | 功能描述:IC REG BUCK ADJ 2A 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| SC4524EVB | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Programmable Frequency, 2A Output 30V Step-Down Switching Regulator |
| SC4524SETRT | 功能描述:IC REG BUCK 2A 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:两者兼有 输出数:1 输出电压:5V，1 V ~ 10 V 输入电压:3.5 V ~ 28 V PWM 型:电流模式 频率 - 开关:220kHz ~ 1MHz 电流 - 输出:600mA 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-SSOP（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:16-QSOP |
发布紧急采购，3分钟左右您将得到回复。